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gre: add support for MikroTik Ethernet-over-IP hack.
[tcpdump] / print-bootp.c
1 /*
2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 /* \summary: BOOTP and IPv4 DHCP printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include "netdissect-stdinc.h"
29
30 #include <string.h>
31
32 #define ND_LONGJMP_FROM_TCHECK
33 #include "netdissect.h"
34 #include "addrtoname.h"
35 #include "extract.h"
36
37
38 /*
39 * Bootstrap Protocol (BOOTP). RFC951 and RFC1048.
40 *
41 * This file specifies the "implementation-independent" BOOTP protocol
42 * information which is common to both client and server.
43 *
44 * Copyright 1988 by Carnegie Mellon.
45 *
46 * Permission to use, copy, modify, and distribute this program for any
47 * purpose and without fee is hereby granted, provided that this copyright
48 * and permission notice appear on all copies and supporting documentation,
49 * the name of Carnegie Mellon not be used in advertising or publicity
50 * pertaining to distribution of the program without specific prior
51 * permission, and notice be given in supporting documentation that copying
52 * and distribution is by permission of Carnegie Mellon and Stanford
53 * University. Carnegie Mellon makes no representations about the
54 * suitability of this software for any purpose. It is provided "as is"
55 * without express or implied warranty.
56 */
57
58 struct bootp {
59 nd_uint8_t bp_op; /* packet opcode type */
60 nd_uint8_t bp_htype; /* hardware addr type */
61 nd_uint8_t bp_hlen; /* hardware addr length */
62 nd_uint8_t bp_hops; /* gateway hops */
63 nd_uint32_t bp_xid; /* transaction ID */
64 nd_uint16_t bp_secs; /* seconds since boot began */
65 nd_uint16_t bp_flags; /* flags - see bootp_flag_values[]
66 in print-bootp.c */
67 nd_ipv4 bp_ciaddr; /* client IP address */
68 nd_ipv4 bp_yiaddr; /* 'your' IP address */
69 nd_ipv4 bp_siaddr; /* server IP address */
70 nd_ipv4 bp_giaddr; /* gateway IP address */
71 nd_byte bp_chaddr[16]; /* client hardware address */
72 nd_byte bp_sname[64]; /* server host name */
73 nd_byte bp_file[128]; /* boot file name */
74 nd_byte bp_vend[64]; /* vendor-specific area */
75 };
76
77 #define BOOTPREPLY 2
78 #define BOOTPREQUEST 1
79
80 /*
81 * Vendor magic cookie (v_magic) for CMU
82 */
83 #define VM_CMU "CMU"
84
85 /*
86 * Vendor magic cookie (v_magic) for RFC1048
87 */
88 #define VM_RFC1048 { 99, 130, 83, 99 }
89
90 /*
91 * RFC1048 tag values used to specify what information is being supplied in
92 * the vendor field of the packet.
93 */
94
95 #define TAG_PAD ((uint8_t) 0)
96 #define TAG_SUBNET_MASK ((uint8_t) 1)
97 #define TAG_TIME_OFFSET ((uint8_t) 2)
98 #define TAG_GATEWAY ((uint8_t) 3)
99 #define TAG_TIME_SERVER ((uint8_t) 4)
100 #define TAG_NAME_SERVER ((uint8_t) 5)
101 #define TAG_DOMAIN_SERVER ((uint8_t) 6)
102 #define TAG_LOG_SERVER ((uint8_t) 7)
103 #define TAG_COOKIE_SERVER ((uint8_t) 8)
104 #define TAG_LPR_SERVER ((uint8_t) 9)
105 #define TAG_IMPRESS_SERVER ((uint8_t) 10)
106 #define TAG_RLP_SERVER ((uint8_t) 11)
107 #define TAG_HOSTNAME ((uint8_t) 12)
108 #define TAG_BOOTSIZE ((uint8_t) 13)
109 #define TAG_END ((uint8_t) 255)
110 /* RFC1497 tags */
111 #define TAG_DUMPPATH ((uint8_t) 14)
112 #define TAG_DOMAINNAME ((uint8_t) 15)
113 #define TAG_SWAP_SERVER ((uint8_t) 16)
114 #define TAG_ROOTPATH ((uint8_t) 17)
115 #define TAG_EXTPATH ((uint8_t) 18)
116 /* RFC2132 */
117 #define TAG_IP_FORWARD ((uint8_t) 19)
118 #define TAG_NL_SRCRT ((uint8_t) 20)
119 #define TAG_PFILTERS ((uint8_t) 21)
120 #define TAG_REASS_SIZE ((uint8_t) 22)
121 #define TAG_DEF_TTL ((uint8_t) 23)
122 #define TAG_MTU_TIMEOUT ((uint8_t) 24)
123 #define TAG_MTU_TABLE ((uint8_t) 25)
124 #define TAG_INT_MTU ((uint8_t) 26)
125 #define TAG_LOCAL_SUBNETS ((uint8_t) 27)
126 #define TAG_BROAD_ADDR ((uint8_t) 28)
127 #define TAG_DO_MASK_DISC ((uint8_t) 29)
128 #define TAG_SUPPLY_MASK ((uint8_t) 30)
129 #define TAG_DO_RDISC ((uint8_t) 31)
130 #define TAG_RTR_SOL_ADDR ((uint8_t) 32)
131 #define TAG_STATIC_ROUTE ((uint8_t) 33)
132 #define TAG_USE_TRAILERS ((uint8_t) 34)
133 #define TAG_ARP_TIMEOUT ((uint8_t) 35)
134 #define TAG_ETH_ENCAP ((uint8_t) 36)
135 #define TAG_TCP_TTL ((uint8_t) 37)
136 #define TAG_TCP_KEEPALIVE ((uint8_t) 38)
137 #define TAG_KEEPALIVE_GO ((uint8_t) 39)
138 #define TAG_NIS_DOMAIN ((uint8_t) 40)
139 #define TAG_NIS_SERVERS ((uint8_t) 41)
140 #define TAG_NTP_SERVERS ((uint8_t) 42)
141 #define TAG_VENDOR_OPTS ((uint8_t) 43)
142 #define TAG_NETBIOS_NS ((uint8_t) 44)
143 #define TAG_NETBIOS_DDS ((uint8_t) 45)
144 #define TAG_NETBIOS_NODE ((uint8_t) 46)
145 #define TAG_NETBIOS_SCOPE ((uint8_t) 47)
146 #define TAG_XWIN_FS ((uint8_t) 48)
147 #define TAG_XWIN_DM ((uint8_t) 49)
148 #define TAG_NIS_P_DOMAIN ((uint8_t) 64)
149 #define TAG_NIS_P_SERVERS ((uint8_t) 65)
150 #define TAG_MOBILE_HOME ((uint8_t) 68)
151 #define TAG_SMPT_SERVER ((uint8_t) 69)
152 #define TAG_POP3_SERVER ((uint8_t) 70)
153 #define TAG_NNTP_SERVER ((uint8_t) 71)
154 #define TAG_WWW_SERVER ((uint8_t) 72)
155 #define TAG_FINGER_SERVER ((uint8_t) 73)
156 #define TAG_IRC_SERVER ((uint8_t) 74)
157 #define TAG_STREETTALK_SRVR ((uint8_t) 75)
158 #define TAG_STREETTALK_STDA ((uint8_t) 76)
159 /* DHCP options */
160 #define TAG_REQUESTED_IP ((uint8_t) 50)
161 #define TAG_IP_LEASE ((uint8_t) 51)
162 #define TAG_OPT_OVERLOAD ((uint8_t) 52)
163 #define TAG_TFTP_SERVER ((uint8_t) 66)
164 #define TAG_BOOTFILENAME ((uint8_t) 67)
165 #define TAG_DHCP_MESSAGE ((uint8_t) 53)
166 #define TAG_SERVER_ID ((uint8_t) 54)
167 #define TAG_PARM_REQUEST ((uint8_t) 55)
168 #define TAG_MESSAGE ((uint8_t) 56)
169 #define TAG_MAX_MSG_SIZE ((uint8_t) 57)
170 #define TAG_RENEWAL_TIME ((uint8_t) 58)
171 #define TAG_REBIND_TIME ((uint8_t) 59)
172 #define TAG_VENDOR_CLASS ((uint8_t) 60)
173 #define TAG_CLIENT_ID ((uint8_t) 61)
174 /* RFC 2241 */
175 #define TAG_NDS_SERVERS ((uint8_t) 85)
176 #define TAG_NDS_TREE_NAME ((uint8_t) 86)
177 #define TAG_NDS_CONTEXT ((uint8_t) 87)
178 /* RFC 2242 */
179 #define TAG_NDS_IPDOMAIN ((uint8_t) 62)
180 #define TAG_NDS_IPINFO ((uint8_t) 63)
181 /* RFC 2485 */
182 #define TAG_OPEN_GROUP_UAP ((uint8_t) 98)
183 /* RFC 2563 */
184 #define TAG_DISABLE_AUTOCONF ((uint8_t) 116)
185 /* RFC 2610 */
186 #define TAG_SLP_DA ((uint8_t) 78)
187 #define TAG_SLP_SCOPE ((uint8_t) 79)
188 /* RFC 2937 */
189 #define TAG_NS_SEARCH ((uint8_t) 117)
190 /* RFC 3004 - The User Class Option for DHCP */
191 #define TAG_USER_CLASS ((uint8_t) 77)
192 /* RFC 3011 */
193 #define TAG_IP4_SUBNET_SELECT ((uint8_t) 118)
194 /* RFC 3442 */
195 #define TAG_CLASSLESS_STATIC_RT ((uint8_t) 121)
196 #define TAG_CLASSLESS_STA_RT_MS ((uint8_t) 249)
197 /* RFC8572 */
198 #define TAG_SZTP_REDIRECT ((uint8_t) 143)
199 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */
200 #define TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150)
201 /* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml */
202 #define TAG_SLP_NAMING_AUTH ((uint8_t) 80)
203 #define TAG_CLIENT_FQDN ((uint8_t) 81)
204 #define TAG_AGENT_CIRCUIT ((uint8_t) 82)
205 #define TAG_AGENT_REMOTE ((uint8_t) 83)
206 #define TAG_TZ_STRING ((uint8_t) 88)
207 #define TAG_FQDN_OPTION ((uint8_t) 89)
208 #define TAG_AUTH ((uint8_t) 90)
209 #define TAG_CLIENT_LAST_TRANSACTION_TIME ((uint8_t) 91)
210 #define TAG_ASSOCIATED_IP ((uint8_t) 92)
211 #define TAG_CLIENT_ARCH ((uint8_t) 93)
212 #define TAG_CLIENT_NDI ((uint8_t) 94)
213 #define TAG_CLIENT_GUID ((uint8_t) 97)
214 #define TAG_LDAP_URL ((uint8_t) 95)
215 /* RFC 4833, TZ codes */
216 #define TAG_TZ_PCODE ((uint8_t) 100)
217 #define TAG_TZ_TCODE ((uint8_t) 101)
218 #define TAG_NETINFO_PARENT ((uint8_t) 112)
219 #define TAG_NETINFO_PARENT_TAG ((uint8_t) 113)
220 #define TAG_URL ((uint8_t) 114)
221 #define TAG_MUDURL ((uint8_t) 161)
222
223 /* DHCP Message types (values for TAG_DHCP_MESSAGE option) */
224 #define DHCPDISCOVER 1
225 #define DHCPOFFER 2
226 #define DHCPREQUEST 3
227 #define DHCPDECLINE 4
228 #define DHCPACK 5
229 #define DHCPNAK 6
230 #define DHCPRELEASE 7
231 #define DHCPINFORM 8
232 /* Defined in RFC4388 */
233 #define DHCPLEASEQUERY 10
234 #define DHCPLEASEUNASSIGNED 11
235 #define DHCPLEASEUNKNOWN 12
236 #define DHCPLEASEACTIVE 13
237
238
239 /*
240 * "vendor" data permitted for CMU bootp clients.
241 */
242
243 struct cmu_vend {
244 nd_byte v_magic[4]; /* magic number */
245 nd_uint32_t v_flags; /* flags/opcodes, etc. */
246 nd_ipv4 v_smask; /* Subnet mask */
247 nd_ipv4 v_dgate; /* Default gateway */
248 nd_ipv4 v_dns1, v_dns2; /* Domain name servers */
249 nd_ipv4 v_ins1, v_ins2; /* IEN-116 name servers */
250 nd_ipv4 v_ts1, v_ts2; /* Time servers */
251 nd_byte v_unused[24]; /* currently unused */
252 };
253
254
255 /* v_flags values */
256 #define VF_SMASK 1 /* Subnet mask field contains valid data */
257
258 /* RFC 4702 DHCP Client FQDN Option */
259
260 #define CLIENT_FQDN_FLAGS_S 0x01
261 #define CLIENT_FQDN_FLAGS_O 0x02
262 #define CLIENT_FQDN_FLAGS_E 0x04
263 #define CLIENT_FQDN_FLAGS_N 0x08
264 /* end of original bootp.h */
265
266 static const struct tok fqdn_flags_bm[] = {
267 { CLIENT_FQDN_FLAGS_S, "S" },
268 { CLIENT_FQDN_FLAGS_O, "O" },
269 { CLIENT_FQDN_FLAGS_E, "E" },
270 { CLIENT_FQDN_FLAGS_N, "N" },
271 { 0, NULL }
272 };
273
274 static void rfc1048_print(netdissect_options *, const u_char *);
275 static void cmu_print(netdissect_options *, const u_char *);
276
277 static const struct tok bootp_flag_values[] = {
278 { 0x8000, "Broadcast" },
279 { 0, NULL}
280 };
281
282 static const struct tok bootp_op_values[] = {
283 { BOOTPREQUEST, "Request" },
284 { BOOTPREPLY, "Reply" },
285 { 0, NULL}
286 };
287
288 /*
289 * Print bootp requests
290 */
291 void
292 bootp_print(netdissect_options *ndo,
293 const u_char *cp, u_int length)
294 {
295 const struct bootp *bp;
296 static const u_char vm_cmu[4] = VM_CMU;
297 static const u_char vm_rfc1048[4] = VM_RFC1048;
298 uint8_t bp_op, bp_htype, bp_hlen;
299
300 ndo->ndo_protocol = "bootp";
301 bp = (const struct bootp *)cp;
302 bp_op = GET_U_1(bp->bp_op);
303 ND_PRINT("BOOTP/DHCP, %s",
304 tok2str(bootp_op_values, "unknown (0x%02x)", bp_op));
305
306 bp_htype = GET_U_1(bp->bp_htype);
307 bp_hlen = GET_U_1(bp->bp_hlen);
308 if (bp_htype == 1 && bp_hlen == MAC_ADDR_LEN && bp_op == BOOTPREQUEST) {
309 ND_PRINT(" from %s", GET_ETHERADDR_STRING(bp->bp_chaddr));
310 }
311
312 ND_PRINT(", length %u", length);
313
314 if (!ndo->ndo_vflag)
315 return;
316
317 ND_TCHECK_2(bp->bp_secs);
318
319 /* The usual hardware address type is 1 (10Mb Ethernet) */
320 if (bp_htype != 1)
321 ND_PRINT(", htype %u", bp_htype);
322
323 /* The usual length for 10Mb Ethernet address is 6 bytes */
324 if (bp_htype != 1 || bp_hlen != MAC_ADDR_LEN)
325 ND_PRINT(", hlen %u", bp_hlen);
326
327 /* Only print interesting fields */
328 if (GET_U_1(bp->bp_hops))
329 ND_PRINT(", hops %u", GET_U_1(bp->bp_hops));
330 if (GET_BE_U_4(bp->bp_xid))
331 ND_PRINT(", xid 0x%x", GET_BE_U_4(bp->bp_xid));
332 if (GET_BE_U_2(bp->bp_secs))
333 ND_PRINT(", secs %u", GET_BE_U_2(bp->bp_secs));
334
335 ND_PRINT(", Flags [%s]",
336 bittok2str(bootp_flag_values, "none", GET_BE_U_2(bp->bp_flags)));
337 if (ndo->ndo_vflag > 1)
338 ND_PRINT(" (0x%04x)", GET_BE_U_2(bp->bp_flags));
339
340 /* Client's ip address */
341 if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_ciaddr))
342 ND_PRINT("\n\t Client-IP %s", GET_IPADDR_STRING(bp->bp_ciaddr));
343
344 /* 'your' ip address (bootp client) */
345 if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_yiaddr))
346 ND_PRINT("\n\t Your-IP %s", GET_IPADDR_STRING(bp->bp_yiaddr));
347
348 /* Server's ip address */
349 if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_siaddr))
350 ND_PRINT("\n\t Server-IP %s", GET_IPADDR_STRING(bp->bp_siaddr));
351
352 /* Gateway's ip address */
353 if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_giaddr))
354 ND_PRINT("\n\t Gateway-IP %s", GET_IPADDR_STRING(bp->bp_giaddr));
355
356 /* Client's Ethernet address */
357 if (bp_htype == 1 && bp_hlen == MAC_ADDR_LEN) {
358 ND_PRINT("\n\t Client-Ethernet-Address %s", GET_ETHERADDR_STRING(bp->bp_chaddr));
359 }
360
361 if (GET_U_1(bp->bp_sname)) { /* get first char only */
362 ND_PRINT("\n\t sname \"");
363 if (nd_printztn(ndo, bp->bp_sname, (u_int)sizeof(bp->bp_sname),
364 NULL) == 0) {
365 /* Within the buffer, but not NUL-terminated. */
366 ND_PRINT("\"");
367 goto invalid;
368 }
369 ND_PRINT("\"");
370 }
371 if (GET_U_1(bp->bp_file)) { /* get first char only */
372 ND_PRINT("\n\t file \"");
373 if (nd_printztn(ndo, bp->bp_file, (u_int)sizeof(bp->bp_file),
374 NULL) == 0) {
375 /* Ditto. */
376 ND_PRINT("\"");
377 goto invalid;
378 }
379 ND_PRINT("\"");
380 }
381
382 /* Decode the vendor buffer */
383 ND_TCHECK_4(bp->bp_vend);
384 if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
385 sizeof(uint32_t)) == 0)
386 rfc1048_print(ndo, bp->bp_vend);
387 else if (memcmp((const char *)bp->bp_vend, vm_cmu,
388 sizeof(uint32_t)) == 0)
389 cmu_print(ndo, bp->bp_vend);
390 else {
391 uint32_t ul;
392
393 ul = GET_BE_U_4(bp->bp_vend);
394 if (ul != 0)
395 ND_PRINT("\n\t Vendor-#0x%x", ul);
396 }
397 return;
398 invalid:
399 nd_print_invalid(ndo);
400 }
401
402 /*
403 * The first character specifies the format to print:
404 * i - ip address (32 bits)
405 * p - ip address pairs (32 bits + 32 bits)
406 * l - long (32 bits)
407 * L - unsigned long (32 bits)
408 * s - short (16 bits)
409 * b - period-separated decimal bytes (variable length)
410 * x - colon-separated hex bytes (variable length)
411 * a - ASCII string (variable length)
412 * B - on/off (8 bits)
413 * $ - special (explicit code to handle)
414 */
415 static const struct tok tag2str[] = {
416 /* RFC1048 tags */
417 { TAG_PAD, " PAD" },
418 { TAG_SUBNET_MASK, "iSubnet-Mask" }, /* subnet mask (RFC950) */
419 { TAG_TIME_OFFSET, "LTime-Zone" }, /* seconds from UTC */
420 { TAG_GATEWAY, "iDefault-Gateway" }, /* default gateway */
421 { TAG_TIME_SERVER, "iTime-Server" }, /* time servers (RFC868) */
422 { TAG_NAME_SERVER, "iIEN-Name-Server" }, /* IEN name servers (IEN116) */
423 { TAG_DOMAIN_SERVER, "iDomain-Name-Server" }, /* domain name (RFC1035) */
424 { TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */
425 { TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */
426 { TAG_LPR_SERVER, "iLPR-Server" }, /* lpr server (RFC1179) */
427 { TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */
428 { TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */
429 { TAG_HOSTNAME, "aHostname" }, /* ASCII hostname */
430 { TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */
431 { TAG_END, " END" },
432 /* RFC1497 tags */
433 { TAG_DUMPPATH, "aDP" },
434 { TAG_DOMAINNAME, "aDomain-Name" },
435 { TAG_SWAP_SERVER, "iSS" },
436 { TAG_ROOTPATH, "aRP" },
437 { TAG_EXTPATH, "aEP" },
438 /* RFC2132 tags */
439 { TAG_IP_FORWARD, "BIPF" },
440 { TAG_NL_SRCRT, "BSRT" },
441 { TAG_PFILTERS, "pPF" },
442 { TAG_REASS_SIZE, "sRSZ" },
443 { TAG_DEF_TTL, "bTTL" },
444 { TAG_MTU_TIMEOUT, "lMTU-Timeout" },
445 { TAG_MTU_TABLE, "sMTU-Table" },
446 { TAG_INT_MTU, "sMTU" },
447 { TAG_LOCAL_SUBNETS, "BLSN" },
448 { TAG_BROAD_ADDR, "iBR" },
449 { TAG_DO_MASK_DISC, "BMD" },
450 { TAG_SUPPLY_MASK, "BMS" },
451 { TAG_DO_RDISC, "BRouter-Discovery" },
452 { TAG_RTR_SOL_ADDR, "iRSA" },
453 { TAG_STATIC_ROUTE, "pStatic-Route" },
454 { TAG_USE_TRAILERS, "BUT" },
455 { TAG_ARP_TIMEOUT, "lAT" },
456 { TAG_ETH_ENCAP, "BIE" },
457 { TAG_TCP_TTL, "bTT" },
458 { TAG_TCP_KEEPALIVE, "lKI" },
459 { TAG_KEEPALIVE_GO, "BKG" },
460 { TAG_NIS_DOMAIN, "aYD" },
461 { TAG_NIS_SERVERS, "iYS" },
462 { TAG_NTP_SERVERS, "iNTP" },
463 { TAG_VENDOR_OPTS, "bVendor-Option" },
464 { TAG_NETBIOS_NS, "iNetbios-Name-Server" },
465 { TAG_NETBIOS_DDS, "iWDD" },
466 { TAG_NETBIOS_NODE, "$Netbios-Node" },
467 { TAG_NETBIOS_SCOPE, "aNetbios-Scope" },
468 { TAG_XWIN_FS, "iXFS" },
469 { TAG_XWIN_DM, "iXDM" },
470 { TAG_NIS_P_DOMAIN, "sN+D" },
471 { TAG_NIS_P_SERVERS, "iN+S" },
472 { TAG_MOBILE_HOME, "iMH" },
473 { TAG_SMPT_SERVER, "iSMTP" },
474 { TAG_POP3_SERVER, "iPOP3" },
475 { TAG_NNTP_SERVER, "iNNTP" },
476 { TAG_WWW_SERVER, "iWWW" },
477 { TAG_FINGER_SERVER, "iFG" },
478 { TAG_IRC_SERVER, "iIRC" },
479 { TAG_STREETTALK_SRVR, "iSTS" },
480 { TAG_STREETTALK_STDA, "iSTDA" },
481 { TAG_REQUESTED_IP, "iRequested-IP" },
482 { TAG_IP_LEASE, "lLease-Time" },
483 { TAG_OPT_OVERLOAD, "$OO" },
484 { TAG_TFTP_SERVER, "aTFTP" },
485 { TAG_BOOTFILENAME, "aBF" },
486 { TAG_DHCP_MESSAGE, " DHCP-Message" },
487 { TAG_SERVER_ID, "iServer-ID" },
488 { TAG_PARM_REQUEST, "bParameter-Request" },
489 { TAG_MESSAGE, "aMSG" },
490 { TAG_MAX_MSG_SIZE, "sMSZ" },
491 { TAG_RENEWAL_TIME, "lRN" },
492 { TAG_REBIND_TIME, "lRB" },
493 { TAG_VENDOR_CLASS, "aVendor-Class" },
494 { TAG_CLIENT_ID, "$Client-ID" },
495 /* RFC 2485 */
496 { TAG_OPEN_GROUP_UAP, "aUAP" },
497 /* RFC 2563 */
498 { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
499 /* RFC 2610 */
500 { TAG_SLP_DA, "bSLP-DA" }, /*"b" is a little wrong */
501 { TAG_SLP_SCOPE, "bSLP-SCOPE" }, /*"b" is a little wrong */
502 /* RFC 2937 */
503 { TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */
504 /* RFC 3004 - The User Class Option for DHCP */
505 { TAG_USER_CLASS, "$User-Class" },
506 /* RFC 3011 */
507 { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
508 /* RFC 3442 */
509 { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
510 { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
511 /* RFC 8572 */
512 { TAG_SZTP_REDIRECT, "$SZTP-Redirect" },
513 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */
514 { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" },
515 /* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#options */
516 { TAG_SLP_NAMING_AUTH, "aSLP-NA" },
517 { TAG_CLIENT_FQDN, "$FQDN" },
518 { TAG_AGENT_CIRCUIT, "$Agent-Information" },
519 { TAG_AGENT_REMOTE, "bARMT" },
520 { TAG_TZ_STRING, "aTZSTR" },
521 { TAG_FQDN_OPTION, "bFQDNS" }, /* XXX 'b' */
522 { TAG_AUTH, "bAUTH" }, /* XXX 'b' */
523 { TAG_CLIENT_LAST_TRANSACTION_TIME, "LLast-Transaction-Time" },
524 { TAG_ASSOCIATED_IP, "iAssociated-IP" },
525 { TAG_CLIENT_ARCH, "sARCH" },
526 { TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */
527 { TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */
528 { TAG_LDAP_URL, "aLDAP" },
529 { TAG_TZ_PCODE, "aPOSIX-TZ" },
530 { TAG_TZ_TCODE, "aTZ-Name" },
531 { TAG_NETINFO_PARENT, "iNI" },
532 { TAG_NETINFO_PARENT_TAG, "aNITAG" },
533 { TAG_URL, "aURL" },
534 { TAG_MUDURL, "aMUD-URL" },
535 { 0, NULL }
536 };
537
538 /* DHCP "options overload" types */
539 static const struct tok oo2str[] = {
540 { 1, "file" },
541 { 2, "sname" },
542 { 3, "file+sname" },
543 { 0, NULL }
544 };
545
546 /* NETBIOS over TCP/IP node type options */
547 static const struct tok nbo2str[] = {
548 { 0x1, "b-node" },
549 { 0x2, "p-node" },
550 { 0x4, "m-node" },
551 { 0x8, "h-node" },
552 { 0, NULL }
553 };
554
555 /* ARP Hardware types, for Client-ID option */
556 static const struct tok arp2str[] = {
557 { 0x1, "ether" },
558 { 0x6, "ieee802" },
559 { 0x7, "arcnet" },
560 { 0xf, "frelay" },
561 { 0x17, "strip" },
562 { 0x18, "ieee1394" },
563 { 0, NULL }
564 };
565
566 static const struct tok dhcp_msg_values[] = {
567 { DHCPDISCOVER, "Discover" },
568 { DHCPOFFER, "Offer" },
569 { DHCPREQUEST, "Request" },
570 { DHCPDECLINE, "Decline" },
571 { DHCPACK, "ACK" },
572 { DHCPNAK, "NACK" },
573 { DHCPRELEASE, "Release" },
574 { DHCPINFORM, "Inform" },
575 { DHCPLEASEQUERY, "LeaseQuery" },
576 { DHCPLEASEUNASSIGNED, "LeaseUnassigned" },
577 { DHCPLEASEUNKNOWN, "LeaseUnknown" },
578 { DHCPLEASEACTIVE, "LeaseActive" },
579 { 0, NULL }
580 };
581
582 #define AGENT_SUBOPTION_CIRCUIT_ID 1 /* RFC 3046 */
583 #define AGENT_SUBOPTION_REMOTE_ID 2 /* RFC 3046 */
584 #define AGENT_SUBOPTION_SUBSCRIBER_ID 6 /* RFC 3993 */
585 static const struct tok agent_suboption_values[] = {
586 { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
587 { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" },
588 { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
589 { 0, NULL }
590 };
591
592
593 static void
594 rfc1048_print(netdissect_options *ndo,
595 const u_char *bp)
596 {
597 uint16_t tag;
598 u_int len;
599 const char *cp;
600 char c;
601 int first, idx;
602 uint8_t subopt, suboptlen;
603
604 ND_PRINT("\n\t Vendor-rfc1048 Extensions");
605
606 /* Step over magic cookie */
607 ND_PRINT("\n\t Magic Cookie 0x%08x", GET_BE_U_4(bp));
608 bp += sizeof(int32_t);
609
610 /* Loop while we there is a tag left in the buffer */
611 while (ND_TTEST_1(bp)) {
612 tag = GET_U_1(bp);
613 bp++;
614 if (tag == TAG_PAD && ndo->ndo_vflag < 3)
615 continue;
616 if (tag == TAG_END && ndo->ndo_vflag < 3)
617 return;
618 cp = tok2str(tag2str, "?Unknown", tag);
619 c = *cp++;
620
621 if (tag == TAG_PAD || tag == TAG_END)
622 len = 0;
623 else {
624 /* Get the length; check for truncation */
625 len = GET_U_1(bp);
626 bp++;
627 }
628
629 ND_PRINT("\n\t %s (%u), length %u%s", cp, tag, len,
630 len > 0 ? ": " : "");
631
632 if (tag == TAG_PAD && ndo->ndo_vflag > 2) {
633 u_int ntag = 1;
634 while (ND_TTEST_1(bp) &&
635 GET_U_1(bp) == TAG_PAD) {
636 bp++;
637 ntag++;
638 }
639 if (ntag > 1)
640 ND_PRINT(", occurs %u", ntag);
641 }
642
643 ND_TCHECK_LEN(bp, len);
644
645 if (tag == TAG_DHCP_MESSAGE && len == 1) {
646 ND_PRINT("%s",
647 tok2str(dhcp_msg_values, "Unknown (%u)", GET_U_1(bp)));
648 bp++;
649 continue;
650 }
651
652 if (tag == TAG_PARM_REQUEST) {
653 idx = 0;
654 while (len > 0) {
655 uint8_t innertag = GET_U_1(bp);
656 bp++;
657 len--;
658 cp = tok2str(tag2str, "?Unknown", innertag);
659 if (idx % 4 == 0)
660 ND_PRINT("\n\t ");
661 else
662 ND_PRINT(", ");
663 ND_PRINT("%s (%u)", cp + 1, innertag);
664 idx++;
665 }
666 continue;
667 }
668
669 /* Print data */
670 if (c == '?') {
671 /* Base default formats for unknown tags on data size */
672 if (len & 1)
673 c = 'b';
674 else if (len & 2)
675 c = 's';
676 else
677 c = 'l';
678 }
679 first = 1;
680 switch (c) {
681
682 case 'a':
683 /* ASCII strings */
684 ND_PRINT("\"");
685 nd_printjn(ndo, bp, len);
686 ND_PRINT("\"");
687 bp += len;
688 len = 0;
689 break;
690
691 case 'i':
692 case 'l':
693 case 'L':
694 /* ip addresses/32-bit words */
695 while (len >= 4) {
696 if (!first)
697 ND_PRINT(",");
698 if (c == 'i')
699 ND_PRINT("%s", GET_IPADDR_STRING(bp));
700 else if (c == 'L')
701 ND_PRINT("%d", GET_BE_S_4(bp));
702 else
703 ND_PRINT("%u", GET_BE_U_4(bp));
704 bp += 4;
705 len -= 4;
706 first = 0;
707 }
708 break;
709
710 case 'p':
711 /* IP address pairs */
712 while (len >= 2*4) {
713 if (!first)
714 ND_PRINT(",");
715 ND_PRINT("(%s:", GET_IPADDR_STRING(bp));
716 bp += 4;
717 len -= 4;
718 ND_PRINT("%s)", GET_IPADDR_STRING(bp));
719 bp += 4;
720 len -= 4;
721 first = 0;
722 }
723 break;
724
725 case 's':
726 /* shorts */
727 while (len >= 2) {
728 if (!first)
729 ND_PRINT(",");
730 ND_PRINT("%u", GET_BE_U_2(bp));
731 bp += 2;
732 len -= 2;
733 first = 0;
734 }
735 break;
736
737 case 'B':
738 /* boolean */
739 while (len > 0) {
740 uint8_t bool_value;
741 if (!first)
742 ND_PRINT(",");
743 bool_value = GET_U_1(bp);
744 switch (bool_value) {
745 case 0:
746 ND_PRINT("N");
747 break;
748 case 1:
749 ND_PRINT("Y");
750 break;
751 default:
752 ND_PRINT("%u?", bool_value);
753 break;
754 }
755 ++bp;
756 --len;
757 first = 0;
758 }
759 break;
760
761 case 'b':
762 case 'x':
763 default:
764 /* Bytes */
765 while (len > 0) {
766 uint8_t byte_value;
767 if (!first)
768 ND_PRINT(c == 'x' ? ":" : ".");
769 byte_value = GET_U_1(bp);
770 if (c == 'x')
771 ND_PRINT("%02x", byte_value);
772 else
773 ND_PRINT("%u", byte_value);
774 ++bp;
775 --len;
776 first = 0;
777 }
778 break;
779
780 case '$':
781 /* Guys we can't handle with one of the usual cases */
782 switch (tag) {
783
784 case TAG_NETBIOS_NODE:
785 /* this option should be at least 1 byte long */
786 if (len < 1) {
787 ND_PRINT("[ERROR: length < 1 bytes]");
788 break;
789 }
790 tag = GET_U_1(bp);
791 ++bp;
792 --len;
793 ND_PRINT("%s", tok2str(nbo2str, NULL, tag));
794 break;
795
796 case TAG_OPT_OVERLOAD:
797 /* this option should be at least 1 byte long */
798 if (len < 1) {
799 ND_PRINT("[ERROR: length < 1 bytes]");
800 break;
801 }
802 tag = GET_U_1(bp);
803 ++bp;
804 --len;
805 ND_PRINT("%s", tok2str(oo2str, NULL, tag));
806 break;
807
808 case TAG_CLIENT_FQDN:
809 /* this option should be at least 3 bytes long */
810 if (len < 3) {
811 ND_PRINT("[ERROR: length < 3 bytes]");
812 bp += len;
813 len = 0;
814 break;
815 }
816 if (GET_U_1(bp) & 0xf0) {
817 ND_PRINT("[ERROR: MBZ nibble 0x%x != 0] ",
818 (GET_U_1(bp) & 0xf0) >> 4);
819 }
820 if (GET_U_1(bp) & 0x0f)
821 ND_PRINT("[%s] ",
822 bittok2str_nosep(fqdn_flags_bm, "", (GET_U_1(bp))));
823 bp++;
824 if (GET_U_1(bp) || GET_U_1(bp + 1))
825 ND_PRINT("%u/%u ", GET_U_1(bp),
826 GET_U_1(bp + 1));
827 bp += 2;
828 ND_PRINT("\"");
829 nd_printjn(ndo, bp, len - 3);
830 ND_PRINT("\"");
831 bp += len - 3;
832 len = 0;
833 break;
834
835 case TAG_CLIENT_ID:
836 {
837 int type;
838
839 /* this option should be at least 1 byte long */
840 if (len < 1) {
841 ND_PRINT("[ERROR: length < 1 bytes]");
842 break;
843 }
844 type = GET_U_1(bp);
845 bp++;
846 len--;
847 if (type == 0) {
848 ND_PRINT("\"");
849 nd_printjn(ndo, bp, len);
850 ND_PRINT("\"");
851 bp += len;
852 len = 0;
853 break;
854 } else {
855 ND_PRINT("%s ", tok2str(arp2str, "hardware-type %u,", type));
856 while (len > 0) {
857 if (!first)
858 ND_PRINT(":");
859 ND_PRINT("%02x", GET_U_1(bp));
860 ++bp;
861 --len;
862 first = 0;
863 }
864 }
865 break;
866 }
867
868 case TAG_AGENT_CIRCUIT:
869 while (len >= 2) {
870 subopt = GET_U_1(bp);
871 suboptlen = GET_U_1(bp + 1);
872 bp += 2;
873 len -= 2;
874 if (suboptlen > len) {
875 ND_PRINT("\n\t %s SubOption %u, length %u: length goes past end of option",
876 tok2str(agent_suboption_values, "Unknown", subopt),
877 subopt,
878 suboptlen);
879 bp += len;
880 len = 0;
881 break;
882 }
883 ND_PRINT("\n\t %s SubOption %u, length %u: ",
884 tok2str(agent_suboption_values, "Unknown", subopt),
885 subopt,
886 suboptlen);
887 switch (subopt) {
888
889 case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
890 case AGENT_SUBOPTION_REMOTE_ID:
891 case AGENT_SUBOPTION_SUBSCRIBER_ID:
892 nd_printjn(ndo, bp, suboptlen);
893 break;
894
895 default:
896 print_unknown_data(ndo, bp, "\n\t\t", suboptlen);
897 }
898
899 len -= suboptlen;
900 bp += suboptlen;
901 }
902 break;
903
904 case TAG_CLASSLESS_STATIC_RT:
905 case TAG_CLASSLESS_STA_RT_MS:
906 {
907 u_int mask_width, significant_octets, i;
908
909 /* this option should be at least 5 bytes long */
910 if (len < 5) {
911 ND_PRINT("[ERROR: length < 5 bytes]");
912 bp += len;
913 len = 0;
914 break;
915 }
916 while (len > 0) {
917 if (!first)
918 ND_PRINT(",");
919 mask_width = GET_U_1(bp);
920 bp++;
921 len--;
922 /* mask_width <= 32 */
923 if (mask_width > 32) {
924 ND_PRINT("[ERROR: Mask width (%u) > 32]", mask_width);
925 bp += len;
926 len = 0;
927 break;
928 }
929 significant_octets = (mask_width + 7) / 8;
930 /* significant octets + router(4) */
931 if (len < significant_octets + 4) {
932 ND_PRINT("[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4);
933 bp += len;
934 len = 0;
935 break;
936 }
937 ND_PRINT("(");
938 if (mask_width == 0)
939 ND_PRINT("default");
940 else {
941 for (i = 0; i < significant_octets ; i++) {
942 if (i > 0)
943 ND_PRINT(".");
944 ND_PRINT("%u",
945 GET_U_1(bp));
946 bp++;
947 }
948 for (i = significant_octets ; i < 4 ; i++)
949 ND_PRINT(".0");
950 ND_PRINT("/%u", mask_width);
951 }
952 ND_PRINT(":%s)", GET_IPADDR_STRING(bp));
953 bp += 4;
954 len -= (significant_octets + 4);
955 first = 0;
956 }
957 break;
958 }
959
960 case TAG_USER_CLASS:
961 {
962 u_int suboptnumber = 1;
963
964 first = 1;
965 if (len < 2) {
966 ND_PRINT("[ERROR: length < 2 bytes]");
967 bp += len;
968 len = 0;
969 break;
970 }
971 while (len > 0) {
972 suboptlen = GET_U_1(bp);
973 bp++;
974 len--;
975 ND_PRINT("\n\t ");
976 ND_PRINT("instance#%u: ", suboptnumber);
977 if (suboptlen == 0) {
978 ND_PRINT("[ERROR: suboption length must be non-zero]");
979 bp += len;
980 len = 0;
981 break;
982 }
983 if (len < suboptlen) {
984 ND_PRINT("[ERROR: invalid option]");
985 bp += len;
986 len = 0;
987 break;
988 }
989 ND_PRINT("\"");
990 nd_printjn(ndo, bp, suboptlen);
991 ND_PRINT("\"");
992 ND_PRINT(", length %u", suboptlen);
993 suboptnumber++;
994 len -= suboptlen;
995 bp += suboptlen;
996 }
997 break;
998 }
999
1000
1001 case TAG_SZTP_REDIRECT:
1002 /* as per https://datatracker.ietf.org/doc/html/rfc8572#section-8.3
1003 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+
1004 | uri-length | URI |
1005 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+
1006
1007 * uri-length: 2 octets long; specifies the length of the URI data.
1008 * URI: URI of the SZTP bootstrap server.
1009 */
1010 while (len >= 2) {
1011 suboptlen = GET_BE_U_2(bp);
1012 bp += 2;
1013 len -= 2;
1014 ND_PRINT("\n\t ");
1015 ND_PRINT("length %u: ", suboptlen);
1016 if (len < suboptlen) {
1017 ND_PRINT("length goes past end of option");
1018 bp += len;
1019 len = 0;
1020 break;
1021 }
1022 ND_PRINT("\"");
1023 nd_printjn(ndo, bp, suboptlen);
1024 ND_PRINT("\"");
1025 len -= suboptlen;
1026 bp += suboptlen;
1027 }
1028 if (len != 0) {
1029 ND_PRINT("[ERROR: length < 2 bytes]");
1030 }
1031 break;
1032
1033 default:
1034 ND_PRINT("[unknown special tag %u, size %u]",
1035 tag, len);
1036 bp += len;
1037 len = 0;
1038 break;
1039 }
1040 break;
1041 }
1042 /* Data left over? */
1043 if (len) {
1044 ND_PRINT("\n\t trailing data length %u", len);
1045 bp += len;
1046 }
1047 }
1048 }
1049
1050 #define PRINTCMUADDR(m, s) { ND_TCHECK_4(cmu->m); \
1051 if (GET_IPV4_TO_NETWORK_ORDER(cmu->m) != 0) \
1052 ND_PRINT(" %s:%s", s, GET_IPADDR_STRING(cmu->m)); }
1053
1054 static void
1055 cmu_print(netdissect_options *ndo,
1056 const u_char *bp)
1057 {
1058 const struct cmu_vend *cmu;
1059 uint8_t v_flags;
1060
1061 ND_PRINT(" vend-cmu");
1062 cmu = (const struct cmu_vend *)bp;
1063
1064 /* Only print if there are unknown bits */
1065 ND_TCHECK_4(cmu->v_flags);
1066 v_flags = GET_U_1(cmu->v_flags);
1067 if ((v_flags & ~(VF_SMASK)) != 0)
1068 ND_PRINT(" F:0x%x", v_flags);
1069 PRINTCMUADDR(v_dgate, "DG");
1070 PRINTCMUADDR(v_smask, v_flags & VF_SMASK ? "SM" : "SM*");
1071 PRINTCMUADDR(v_dns1, "NS1");
1072 PRINTCMUADDR(v_dns2, "NS2");
1073 PRINTCMUADDR(v_ins1, "IEN1");
1074 PRINTCMUADDR(v_ins2, "IEN2");
1075 PRINTCMUADDR(v_ts1, "TS1");
1076 PRINTCMUADDR(v_ts2, "TS2");
1077 }
1078
1079 #undef PRINTCMUADDR
[mirror] the TCPdump network dissector